Château-Thierry is a city of north-eastern France, about 56 miles east-northeast of Paris. It is a sous-préfecture of the Aisne département, in the Picardie administrative region.

Château-Thierry is situated on the Marne River.

Château-Thierry is the birth place of Jean de La Fontaine.

Château-Thierry was also the site of an important World War I battle in 1918, between American and German troops.